It has been known for some time that working for hours on end without any break is counterproductive. The brain is unable to concentrate for such a long stretch in one go and starts making mistakes and losing motivation. That is why you should take short breaks once in a while. But how much these breaks help you increase your concentration and productivity depends on what you do in them. Here are four tips on how to spend five-to-twenty-minute breaks during the workday to keep you as mentally relaxed and get as much done at work as possible.